Precious metal catalyst

A precious metal catalyst is a type of precious metal material that can alter the rate of a chemical reaction without itself participating in the final product of the reaction. Almost all precious metals can be used as catalysts, but the commonly used ones are platinum, palladium, rhodium, silver, ruthenium, etc. Among them, platinum and rhodium are particularly widely used. Their d-electron orbitals are not fully filled, and the surface is prone to adsorb reactants with moderate strength, which is conducive to the formation of intermediate “active compounds” and has high catalytic activity. At the same time, they also have comprehensive excellent characteristics such as high temperature resistance, oxidation resistance, and corrosion resistance, making them the most important catalyst materials.

Common Specifications：100x100x50

Product Introduction

In 1831, Phillips proposed the contact method using platinum as a catalyst to produce sulfuric acid. By 1875, this method had been industrialized, marking the earliest industrial application of precious metal catalysts. Subsequently, the industrial application of precious metal catalysts has emerged one after another. In 1913, platinum mesh catalyst was used for ammonia oxidation to produce nitric acid; In 1937, Ag/Al2O3 catalyst was used for the oxidation of ethylene to produce ethylene oxide; In 1949, Pt/Al2O3 catalyst was used for petroleum reforming to produce high-quality gasoline; In 1959, PdCl2 CuCl2 catalyst was used for the oxidation of ethylene to acetaldehyde; By the late 1960s, rhodium complex catalysts for the low-pressure carbonylation of methanol to acetic acid had emerged. Since 1974, precious metal catalysts (mainly platinum, supplemented by palladium and rhodium) have been widely promoted and applied in automobile exhaust purification, and quickly developed into the most widely used precious metal catalysts. The development and application of precious metal catalysts have been thriving for over a hundred years (1875-1994). New varieties, new preparation methods, and new application fields are constantly emerging, and the relevant basic theories are also constantly being improved. With the continuous advancement of science and technology, precious metal catalysts will continue to play an important role in some new fields. Of course, due to the scarcity and high cost of precious metal resources, people are constantly researching and developing non precious metal or low content precious metal catalysts.

  1. Platinum (Pt) and palladium (Pd) are the main metals: these two metals are the most common, platinum has high catalytic activity, but is afraid of chlorine; Palladium has better thermal stability and is suitable for treating waste gases such as benzene and toluene.
  2. Gold (Au) is suitable for low temperatures: Gold catalysts exhibit excellent performance at low temperatures, such as ignition at around 20 ℃, but the cost is relatively high and they are usually loaded on specific carriers for use.
  3. Bimetallic effect is better: Nowadays, it is popular to use two metals in combination, such as platinum palladium combination, which can exert synergistic effects, have higher activity than using only one metal, and reduce the amount of precious metals used. ‌‌

  1. Efficient catalytic activity: The unique electronic structure of precious metals endows them with excellent redox ability, such as platinum based catalysts, which can achieve a removal efficiency of over 99% for benzene derivatives.
  2. Wide applicability: It can handle various complex VOCs such as benzene, esters, and ketones, especially suitable for high concentration, multi-component mixed exhaust gases.
  3. Long service life: Precious metals have strong resistance to sintering and poisoning, and can maintain stable activity even in environments containing toxic substances such as sulfur and chlorine.
  4. Energy saving and consumption reducing: The low-temperature reaction characteristics significantly reduce fuel consumption, combined with waste heat recovery technology, effectively reducing comprehensive energy consumption.
  5. Environmental economy: Precious metals can be recycled and reused, reducing operating costs from a full lifecycle perspective.

  1. Automotive exhaust purification: Precious metal catalysts are the core components of automotive exhaust purifiers, which can convert carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) in exhaust into harmless carbon dioxide (CO2), water (H2O), and nitrogen (N2), effectively reducing air pollution.
  2. Chemical production: In the fields of petrochemicals, fine chemicals, etc., precious metal catalysts are used to catalyze hydrogenation, dehydrogenation, oxidation, reduction and other reactions, improve reaction selectivity and yield, reduce energy consumption and waste emissions.
  3. Environmental Protection Management: Precious metal catalysts can also be used in environmental protection fields such as wastewater treatment and exhaust gas purification. Through catalytic oxidation or reduction reactions, harmful substances are converted into harmless or low toxic substances, achieving effective treatment of pollutants.
  4. In the field of energy, such as fuel cells and hydrogen production, precious metal catalysts also play an important role in improving energy conversion efficiency and promoting the development of clean energy.

  1. Avoid poisoning: Precious metal catalysts are susceptible to poisoning caused by certain substances such as sulfur, phosphorus, etc., leading to a decrease in catalytic performance. Therefore, it is necessary to strictly control the raw materials and reaction conditions during use to avoid catalyst poisoning.
  2. Temperature control: The activity of precious metal catalysts is significantly affected by temperature, and temperatures that are too high or too low can affect their catalytic effect. Therefore, it is necessary to control the reaction temperature according to specific reaction conditions to ensure that the catalyst operates within the optimal temperature range.
  3. Regular regeneration: As the usage time prolongs, the activity of precious metal catalysts will gradually decrease. At this point, the catalyst needs to be regenerated to restore its catalytic performance and extend its service life.

Product Display

inquiry

If you wish to submit a formal inquiry, please complete the following form.

Note: Fields marked with * are required.

The product you want to know about
滚动至顶部