Modified quicksand biodiesel catalyst and its preparation method and application

Abstract

The invention relates to a modified quicksand biodiesel catalyst and a preparation method and application thereof. The method comprises the following steps that 1, quicksand is taken, washed and dried, and the dried quicksand is sieved; 2, the sieved quicksand and sodium hydroxide are mixed and calcined for 1-4 h, crushing treatment is conducted, powder A is obtained, and the powder A is soaked in a sulfuric acid solution; 3, centrifugal separation is conducted to remove supernatant, solid of the lower layer is collected and washed through water, the washed solid is calcined for 1-4 h at the temperature ranging from 700 DEG C to 900 DEG C, the calcined solid is ground into powder after being cooled, and the modified quicksand biodiesel catalyst is obtained. According to the modified quicksand biodiesel catalyst and the preparation method and application thereof, modification treatment is conducted on the quicksand, calcium-bearing substances and silicon aluminum oxide of the quicksand are activated, the activity is significantly enhanced, and the catalyst can be recycled for many times; meanwhile, the specific surface area of the catalyst is greatly increased, and the catalytic efficiency is obviously increased. Separation and purification of the modified quicksand biodiesel catalyst are simple, secondary pollution does not exist, and the modified quicksand biodiesel catalyst can effectively catalyze grease to form biodiesel.

Description

【Technical field】 [0001] The invention belongs to the technical field of biodiesel, and relates to a modified quicksand biodiesel catalyst as well as its preparation method and application. 【Background technique】 [0002] Biodiesel is an oxygen-containing clean fuel, which is produced by cracking or transesterification of recycled cooking oil, animal and vegetable oil and other renewable oils. Because of its good lubricity, high cetane number, low sulfur content, non-toxic, biodegradable and other advantages, it is the best substitute for fossil fuels. The usual preparation method is obtained by transesterification under the action of a catalyst. Among them, there are many homogeneous catalysts. The product yield is high under the action of this type of catalyst, but the subsequent separation and purification are difficult, which easily leads to product waste, serious environmental pollution, and short catalyst life. Scholars are now increasingly inclined towards heterogen...

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Problems solved by technology

In summary, these catalysts all have good catalytic effects, and the separation and purification process of the product becomes simple, but the process is more complicated in the preparation process, and the cost of raw materials is relatively high, resulting in no significant increase in the production cost of biodiesel. to lower

[0003] As for quicksand in desert areas, there is no application research at present. Most of the previous component analysis shows that it contains relatively high calcium carbonate. If it is modified to a certain extent, calcium oxide will be produced to catalyze waste oil to prepare biodiesel. It not only achieves the purpose of using waste to treat waste, but also effectively curbs the spread and expansion of the quicksand area. At the same time, it also has a certain beneficial effect on solving the energy crisis, but there is no effective treatment method yet

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