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Palladium chloride powder, also known as palladium dichloride or palladium chloride, with the chemical formula PdCl2 and CAS 7647-10-1. Red brown crystalline powder, deliquescent, easily soluble in dilute hydrochloric acid, stable in air, soluble in ethanol, acetone, and hydrobromic acid, is an inorganic compound. Used for preparing special catalysts and molecular sieves; Sublimation decomposition at 600 ℃; Dihydrate is a deep red hygroscopic crystal. Can be used to prepare non-conductive material coatings; Produce gas sensors, analytical reagents, etc. Determination of palladium, mercury, thallium, and iodine, purification of rare gases, detection of carbon monoxide and cobalt using palladiu chloride test strips; Used for synthesizing semiconductor metal containing polymers, this polymer has a polypyrrole skeleton that conforms to the minimum energy and is close to a plane.
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Chemical Formula |
Cl2Pd |
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Exact Mass |
176 |
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Molecular Weight |
177 |
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m/z |
176 (100.0%), 178 (96.8%), 175 (81.7%), 178 (63.9%), 180 (61.9%), 177 (52.2%), 180 (42.9%), 174 (40.8%), 182 (27.4%), 176 (26.1%), 180 (10.2%), 182 (9.9%), 179 (8.3%), 184 (4.4%), 178 (4.2%), 172 (3.7%), 174 (2.4%) |
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Elemental Analysis |
Cl, 39.98; Pd, 60.02 |
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Palladium chloride powder (PdCl ₂), as an important compound of palladiu element, has become an indispensable key material in modern industry and technology due to its unique chemical properties such as strong catalytic activity, good solubility, and stability. Its application scope covers dozens of industries such as catalysis, electronics, pharmaceuticals, environmental monitoring, and energy development, and has shown great potential in green chemistry and resource recycling.
Palladium chloride is one of the most widely used palladiu compounds in the field of catalysis. Its catalytic activity originates from the unique d-orbital electronic structure of palladium atoms, which can efficiently activate carbon carbon and carbon heteroatom bonds and promote various organic reactions.
Oxidation and hydrogenation of olefins
Ethylene based acetaldehyde production: Palladiu chloride is the core catalyst of the Wacker process, which oxidizes ethylene to acetaldehyde in aqueous solution through air. The reaction conditions are mild (100-120 ℃, 1-2 MPa), and the selectivity of acetaldehyde is over 95%. About 60% of acetaldehyde worldwide is produced through this process, with an annual consumption of over 1000 tons of palladiu chloride.
Terminal olefin oxidation: Palladiu chloride can catalyze the formation of methyl ketones from terminal olefins (such as 1-octene), and the reaction proceeds through a free radical mechanism with a yield of up to 80% -90%. It is an important method for synthesizing fragrances and pharmaceutical intermediates.
Selective hydrogenation of alkynes: Under the catalysis of palladiu chloride ligand system, alkynes can be selectively hydrogenated to cis alkenes, avoiding excessive hydrogenation to alkanes. They are widely used in the synthesis of high value-added products such as vitamin A and steroid hormones.
coupled reaction
Suzuki reaction: palladiu chloride catalyzes the cross coupling of aryl halides with boronic acid esters to generate aromatic compounds. The reaction conditions are mild (room temperature to 80 ℃) and the yield is high (80% -95%). It is a key step in the synthesis of liquid crystal materials and drug molecules, such as the antidepressant fluoxetine.
Heck reaction: Palladium chloride promotes the coupling of olefins with aryl halides to generate substituted olefins, which are widely used in the synthesis of pesticides (such as pyrethroids) and polymer monomers (such as styrene derivatives).
Negishi reaction: palladiu chloride catalyzes the coupling of alkyl zinc reagents with aryl halides to construct carbon carbon bonds, which is an important tool for synthesizing natural products such as paclitaxel side chains.
Carbonylation reaction
Methanol carbonylation to produce acetic acid: The palladiu chloride iodide system can catalyze the reaction of methanol with carbon monoxide to produce acetic acid, with low reaction pressure (3-5 MPa) and high selectivity (>99%), making it the mainstream process for acetic acid industrial production (accounting for over 70% of global production).
Amide carbonylation: Palladiu chloride catalyzes the reaction of aromatic amines with carbon monoxide to produce aromatic amides, which is an important method for synthesizing antibiotics (such as penicillin) and dye intermediates.
Electronics industry: the 'invisible pillar' of high-precision devices
Palladium chloride is mainly used in the electronics industry to prepare materials with high conductivity and stability, and its applications cover multiple fields such as semiconductors, capacitors, sensors, etc.
Palladiu plating and chemical plating
Connector coating: Palladiu chloride, as an additive in the plating solution, can significantly improve the conductivity (contact resistance reduced to 10 ⁻⁴Ω· cm), corrosion resistance (salt spray test>1000 hours), and wear resistance (friction coefficient<0.1) of the connector. It is widely used in the internal connection of consumer electronics products such as mobile phones and computers.
Chemical palladium plating: The palladium chloride powder hypophosphite system can achieve chemical palladiu plating on non-conductive substrates such as plastics and ceramics, with uniform coating thickness (0.1-5 μ m) and strong adhesion. It is a key technology for preparing high-frequency circuit boards and electromagnetic shielding materials.
Multilayer Ceramic Capacitor (MLCC)
Palladium chloride is the main component of MLCC internal electrodes, and its high conductivity (conductivity>10 ⁶ S/m) and thermal stability (melting point 1555 ℃) ensure stable operation of capacitors in high temperature and high frequency environments. The global annual production of MLCC exceeds 5 trillion units, of which palladiu internal electrodes account for over 30%.
semiconductor material
Palladium containing polymer: Palladiu chloride can catalyze the synthesis of polypyrrole skeleton polymer containing palladiu. This material has excellent conductivity (conductivity 10 ⁻ -10 ² S/cm) and chemical stability, and can be used to prepare flexible electrodes, anti-static coatings, etc.
Gas sensitive components: Palladiu chloride film has high sensitivity to gases such as hydrogen and carbon monoxide (detection limit up to ppb level), and is the core material of semiconductor gas sensors, widely used in industrial safety monitoring, automobile exhaust detection and other fields.
Pharmaceutical synthesis: the 'chemical engine' of drug manufacturing
Palladium chloride is mainly used in the pharmaceutical field to catalyze key reaction steps, and its high selectivity and mild reaction conditions can significantly improve the efficiency and purity of drug synthesis.
Chiral drug synthesis
The palladiu chloride chiral ligand system can catalyze asymmetric hydrogenation reactions, producing chiral alcohols, amines and other intermediates, with an enantiomeric excess (ee value) of over 99%. For example, in the synthesis of the anti Parkinson's disease drug levodopa, palladium chloride catalyzed asymmetric hydrogenation of ketone compounds, resulting in an increase in product purity from 85% to 99.5% and a 40% reduction in single ton cost.
Antibiotic synthesis
The palladium chloride catalyzed ring opening reaction of β - lactam is a key step in the synthesis of cephalosporin and penicillin antibiotics. For example, in the synthesis of ceftriaxone, palladiu chloride catalyzes the removal of chlorine atoms from intermediates, resulting in an increase in product purity from 95% to 99.9%, which meets FDA standards.
antitumor drug
Palladium chloride participates in the synthesis of platinum based anti-tumor drugs (such as cisplatin and carboplatin), and constructs drug molecular frameworks through palladiu platinum cross coupling reactions to improve drug stability and biological activity. For example, palladiu chloride catalyzes the coupling of cisplatin with amino acids to generate derivatives that can target tumor cells, resulting in a 30% increase in therapeutic efficacy.
Environmental Governance: The 'Green Guardian' of Pollution Control
Palladium chloride plays an important role in environmental monitoring and pollution control. Its high sensitivity and strong catalytic activity can achieve rapid detection and efficient degradation of pollutants.
Gas detection
Carbon monoxide detection: Palladium chloride test paper immediately turns blue when exposed to trace amounts of CO (1-2 ppm). The reaction principle is as follows:
CO+PdCl2+H2O→CO2+Pd↓+2HCl
This test strip is widely used for detecting gas leaks in coal mines and households, with a sensitivity 10 times higher than traditional detection methods.
Hydrogen leakage detection: The resistance of palladiu chloride film changes significantly with the concentration of hydrogen gas, and can be used for real-time monitoring of hydrogen systems in fuel cell vehicles, with a response time of less than 1 second.
Waste water treatment
Organic pollutant degradation: Palladium chloride catalytic hydrogenation technology can efficiently degrade toxic substances such as nitrobenzene and azo dyes in printing and dyeing wastewater, with a COD removal rate of over 95% and a reaction time reduced from 72 hours in traditional biological methods to 2 hours.
Heavy metal recovery: The palladiu chloride iron powder system can reduce hexavalent chromium (Cr (VI)) in wastewater to trivalent chromium (Cr (III)), reducing toxicity by 99%, and generating chromium hydroxide precipitate for recycling.
Soil remediation
The palladium chloride catalytic reduction technology can remediate heavy metal contaminated soil, such as reducing hexavalent chromium in soil to trivalent chromium. The remediation cycle is shortened from 2 years in traditional chemical methods to 6 months, and the cost is reduced by 60%.
Analysis and Testing: A Precise Tool for Chemical Research
Palladium chloride, as an analytical reagent, can be used for element determination, gas purification, and chemical reaction monitoring. Its high selectivity and sensitivity make it an essential reagent in laboratories.
element determination
Palladium content determination: Palladium chloride is used as a standard reagent to determine the palladiu content in the sample by iodometric or spectrophotometric methods, with a detection limit of 0.01 ppm.
Mercury, Thallium, Iodine Detection: Palladium chloride forms colored complexes with mercury and thallium ions, which can be used for rapid detection of heavy metals in environmental water samples, with a sensitivity 5-10 times higher than traditional methods.
Gas purification
Palladium chloride can adsorb impurities (such as oxygen and nitrogen) in rare gases (such as argon and neon), generate oxides or chlorides through chemical reactions, and purify the gas to a purity of over 99.999%, meeting the requirements of semiconductor manufacturing.
reaction monitor
The palladium chloride butanedione oxime system can be used to monitor the progress of olefin hydrogenation reaction, and the reaction endpoint can be determined in real time through color change (yellow → red) to improve experimental efficiency.
New Energy Technologies: Catalysts for Clean Energy
Palladium chloride powder shows great potential in new energy fields such as hydrogen and biomass energy, and its catalytic activity can promote the improvement of energy conversion and storage efficiency.
Hydrogen energy development
Proton exchange membrane fuel cell (PEMFC): Palladium chloride loaded on carbon support can serve as a catalyst for cathodic oxygen reduction reaction (ORR), with a power density of 1.5 W/cm ² and an extended lifespan of over 5000 hours, making it a potential alternative to platinum based catalysts.
Liquid organic hydrogen carrier (LOHC): palladium chloride catalyzes the hydrogenation/dehydrogenation reaction of toluene methylcyclohexane system, achieving efficient storage and release of hydrogen gas with an energy density of 6.5 wt%, meeting the demand for on-board hydrogen storage.
Biomass conversion
Palladium chloride catalyzed lignin depolymerization can generate phenolic compounds such as vanillin and eugenol, with a yield increased from 10% in traditional acid hydrolysis to 35%. The reaction conditions are mild (150 ℃, 2 MPa), and the carbon footprint is reduced by 70%.
Materials Science: The 'Fundamental Component' of Frontier Technologies
Palladium chloride plays a crucial role in material synthesis, and its catalytic performance can promote the development and application of new materials.
Palladium based alloy
Palladium rhodium alloy: Palladium rhodium alloy can be prepared by co reduction of palladium chloride and rhodium chloride. This alloy has excellent corrosion resistance (resistant to hydrochloric acid and sulfuric acid corrosion) and heat resistance (melting point>1800 ℃), and is widely used in fields such as aerospace engine blades and medical devices (such as heart stents).
Palladium silver alloy: The palladium chloride silver nitrate system can be used to synthesize palladium silver alloy. Its conductivity (conductivity>5 × 10 ⁶ S/m) and oxidation resistance (not oxidized at 400 ℃) make it an ideal material for high-frequency electronic components such as filters and antennas.
Nanomaterials
Palladium chloride precursor: Palladium nanoparticles (particle size 2-10 nm) can be prepared by thermal decomposition of palladium chloride, which has a wide range of applications in catalysis, sensing, and biomedical fields. For example, the TOF value (conversion frequency) of Suzuki reaction catalyzed by palladium nanoparticles reaches 10 ⁵ h ⁻¹, which is 100 times higher than that of traditional catalysts.
A production process of palladium chloride, which is characterized in that it includes the following steps:
Step (1), aqua regia dissolution and concentration for removing nitrate: Carry out aqua regia dissolution and concentration for removing nitrate according to traditional methods to obtain palladium solution;
Step (2), palladium solution concentration and pH adjustment: adjust the palladium solution obtained in step (1) to a palladium concentration of 79g/L and a pH value of 0.9;
Step (3), dispersion: add a dispersion solvent to the palladium solution adjusted in step (2), and the volume of the dispersion solvent added is 4.9% of the palladium solution volume to obtain the dispersed palladium solution; The dispersion solvent is a mixture of ethanol and acetone, and the volume ratio of ethanol and acetone in the dispersion solvent is 18.9:1;
Step (4), spray drying: the dispersed palladium solution obtained in step (3) is spray dried with a spray dryer to obtain palladium chloride powder; The temperature of spray drying is 160-200 ℃, and the feed rate is 1000-1500mL/h;
The nozzle of the spray dryer is made of polytetrafluoroethylene. The nozzle diameter of spray dryer is 0.5mm.
FAQ
Why do some sources claim PdCl2 melts at 678–680°C, while others state it decomposes at 500°C?
This is not a contradiction, but a distinction between the anhydrous form and the dihydrate. The anhydrous salt sublimes/decomposes at 678–680°C . However, heating PdCl₂·2H₂O (dihydrate) or under certain conditions, decomposition begins as low as 500°C . Most commercial "powders" are partially hydrated, leading to conflicting literature data.
What is the practical significance of its rarely-mentioned lattice constants (a=0.382nm, b=0.335nm, c=1.102nm)?
These parameters define its layered crystal structure (space group Pnmn) . The coordination-unsaturated sites along the c-axis serve as preferential nucleation centers for in-situ reduction to Pd(0) nanoparticles. This directly impacts catalyst dispersion and activity, yet is almost never disclosed in commercial SDS sheets.
What is the current "ceiling" for CO detection sensitivity using PdCl₂, and what limits it?
Traditional PdCl₂ test papers are limited by visual readout (~18 ppm). A 2023 breakthrough using a plasmonic hole-array in a silver film filled with PdCl₂·2H₂O pushed the detection limit down to 3.37×10⁻³ ppm . The bottleneck is no longer the chemistry of PdCl₂→Pd reduction, but the signal transduction method. This represents a 3–4 order of magnitude improvement over conventional techniques.
Why is "palladium content (59-60%)" not a reliable indicator of purity for sensitive applications?
The Pd% value only accounts for the metal. It does not reveal trace metal impurities (e.g., Ag, Au, Pt, Fe, Cu, Ni) which can critically poison catalysts or interfere with spectroscopy. High-grade reagents specify these limits (e.g., Ag ≤0.002%, Cu ≤0.001%) . "59% Pd" from different sources is not equivalent without a full impurity profile.
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