Disclosed isthe synthesis of novel supported metal catalytic materials for electromagnetic radiation absorption and chemical catalysis especially in the presence of plasma used in the conversion of nitrogen from air and hydrogen from water to useful products such as nitric acid, hydrogen, ammonia and fertilizers. These materials can also generate plasma when subjected to microwave irradiation thus form the basis of catalytic plasma reactors. They can be used in chemical looping reactions because plasma generation under microwave irradiation in air results in the reduction of catalyst oxides and oxidation of nitrogen.

A method of absorption includes contacting a copper hydroxide nitrate/calcium silicate/graphite-phase carbon nitride [Cu.sub.2(OH).sub.3NO.sub.3/CaSiO.sub.3@g-C.sub.3N.sub.4] nanocomposite catalyst with a solution including one or more pollutants. Further, the method includes absorbing the one or more pollutants on the Cu.sub.2(OH).sub.3NO.sub.3/CaSiO.sub.3@g-C.sub.3N.sub.4 nanocomposite catalyst.

A preparation method and use of a novel pure inorganic solid silicon-based sulfonic acid and/or phosphoric acid catalytic material are disclosed. The surface hydroxyl-rich metasilicic acid is used as the raw material, and by using a sulfonating reagent and/or phosphoric acid, the sulfonic acid group and/or the phosphoric acid group are bonded to the inorganic silicon material by chemical bonding to obtain a pure inorganic solid silicon-based sulfonic acid and/or phosphoric acid catalytic material. The catalytic material can be widely used in many acid-catalyzed organic reactions such as isomerization, esterification, alkylation, hydroamination of olefins, condensation, nitration, etherification, multi-component reactions and oxidation reactions. The inorganic solid silicon-based sulfonic acid and/or phosphoric acid catalytic material of the present invention has the advantages of high acid amount, high activity, good hydrothermal stability, no swelling, simple preparation, low cost, no pollution, no corrosion, easy separation and reusability.

Provided are the preparation of a modified zeolite catalyst, a modified zeolite catalyst and the gas purification method using the same. The preparation is implemented by using a method comprising: mixing a metal salt solution with zeolite to form a non-Newtonian fluid mixture, drying the mixture using microwaves, and finally calcining same, so as to obtain a zeolite catalyst. In the preparation method, microwaves are used to dry the mixture of the metal salt solution and the zeolite, the drying time is short, and the evaporation of water is quick, thereby maintaining the state of metal cations in a zeolite framework, and preventing catalyst particles (metal clusters) from being deintercalated from the zeolite framework and becoming aggregated. The modified zeolite catalyst prepared by using the preparation method contains metal clusters which are uniformly dispersed, and comprises an active component composed of a plurality of metal cations.