Catalysts can induce chemical reactions to change and make chemical reactions faster or slower. Catalysts are also called catalysts in industry. The composition, chemical properties and quality of the catalyst did not change before and after the reaction. It mainly includes solid acid-base catalyst, molecular sieve catalyst, metal catalyst, metal oxide and metal sulfide catalyst, and complex catalyst.
1. Acid-base catalysts: Petroleum refining and petrochemical industry are the largest application fields of catalysts, occupying an important position in the national economy. Acid catalysis plays an important role in petroleum refining and petrochemical industry. Solid acids are further divided into Blans Te Um (B acid) and Lewis acid (L acid). Typical solid base catalysts: MgO, CaO, SrO2, etc; typical solid L acid catalysts: AlCl3, FeCl3, etc.
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Mr. Wang of Yanjin County, Mr. Guo of Zhengzhou City and other readers called the newspaper's Science and Technology 110 telephone consultation and asked how to use greenhouses to produce citrons in autumn and winter. To this end, the reporter interviewed the relevant experts of the newspaper advisory group. Experts made the following answers to this question: First, adjust the temperature, humidity and light. (a) Temperature regulation. Ten to 15 days after the shed is the sapling period, the temperature should be raised, and the shed temperature should be controlled at about 30°C during the day. After germination, the daytime temperature is controlled at 25°C-30°C and the night temperature is controlled at 13°C-17°C. Shooting temperature control at 18 °C ~ 25 °C. (b) humidity regulation. The water absorption capacity of the root system of citrons planted in greenhouses is poor, so the soil and air humidity should be kept high in the initial stage. The relative humidity of the air should be kept at 85%. In sunny days, water should be sprayed on the citrons to prevent dehydration and dryness. After germination, the relative humidity of the air is 70%. (C) light adjustment. Xiangxi hi light, should try to use non-drop film, timely removal of grasshoppers, paper sheets during the day, but also often cleaning debris on the membrane. If the light is too strong, cover the grass properly. The second is to promote the branches. When picking the second musk pod, the top of the musk pod can be removed at the same time and dried (from the top 40 cm above the ground). After drying, 15% paclobutrazol solution was sprayed at a concentration of 200-500 ppm in order to control the apical dominance and promote the rapid growth of branches. After that, according to the growth condition of Citron, timely topping and snoring ensure that the canopy is more branched and produce more fragrant buds to achieve high yield and quality. The third is water and fertilizer management. Toon is a fast-growing woody vegetable with low water requirement, and the demand for potash fertilizer is relatively large. Each quality greenhouse can be fully cooked with about 2500 kg of high-quality farmyard fertilizer and 3-6 kg of potassium dihydrogen phosphate. After each picking, roots can be grown and the citrons will grow, and top dressing and watering will be appropriate. The fourth is bagging. When the ground temperature stabilizes around 18°C ​​in spring, the shed film can be removed and the citron can grow naturally. After that, although it develops faster, it is prone to aging. When the toadstool bud grows to 5 cm in length, it is covered with two layers of black-and-red two-color polyethylene film. This will not only increase the yield but also ensure that the toon buds do not age. This film bag can be used multiple times. The fifth is harvesting. 40 to 60 days after the shed, when the scented shoots grow to 15 cm long and they are well colored, they can be harvested. Harvesting should be conducted every morning and evening. The head buds should be harvested at 12-15 cm in length. The second axillary buds are harvested in time when they grow to 20 cm in length, so as to promote the development of lateral buds and secreted buds and increase the yield. It can be harvested once every 10 days. (Reporter)