| 摘要 |
FIELD: chemistry.SUBSTANCE: described is method for preparation of catalyst on the base of zeolite of NaNHY type with residual content of sodium oxide not higher than 0.8 wt %, which includes soaking while mixing zeolite crystals with lanthanum nitrate water solution in quantity, which provides content of lanthanum in zeolite 3.0 wt %, mixing formed suspension with second suspension, obtained by peptisation of nitric acid water solution to pH 1-3 of aluminium hydroxide powder, granulation of mould mass, re-oxidising at room temperature for 18-24 h, drying with temperature increase of 2 degrees per minute and exposure at 110±10°C for not less than 5 h and tempering with temperature increase of 10 degrees per minute and exposure at 280±10°C for not less than 4 h and at 510±10°C for not less than 4 hours; powders of zeolite and aluminium hydroxide of pseudoboehmite modification have particle size not less than 40 mcm, with additional introduction into mould mass with mixing of powder of sulphated tetragonal zircon dioxide with content 5 wt % of (SO) and with particles with size less than 40 mcm, as well as micro-needle wollastonite non-modified - natural calcium silicate CaSiOwith characteristic ratio l:d = (12-20):1 and length of microneedles 1<20 mcm, with the following weight ratio of components in mould mass, %: zoelite of NaNHY type - (26.14-30.68), lanthanum nitrate (1.90-2.22), aluminium hydroxide (pseudoboehmite) - (14.88-19.40), sulphated zircon oxide - (9.90-14.61) and micro-needle wollastonite - natural calcium silicate CaSiO, nitric acid (0.44-0.57), water - to 100. Also described is catalyst, in which components are in weight ratio, %: zeolite of NaLaHY type - (49-55), aluminium oxide (22-30), sulphated zircon oxide (18-25), calcium silicate - (2-4).EFFECT: increased mechanical strength of granules with preservation of high indices of process - conversion of isobutene and selectivity by trimethylpentanes with increase of their stability.2 cl, 1 tbl, 8 ex |
