無機(jī)鹽在HZSM-5催化乙酸環(huán)己酯水解反應(yīng)中的作用
發(fā)布時(shí)間:2019-04-11 16:35
【摘要】:考察了無機(jī)鹽(NaBr、ZnSO_4、NaHSO_4)對(duì)HZSM-5催化乙酸環(huán)己酯水解制備環(huán)己醇反應(yīng)的影響。結(jié)果表明,無機(jī)鹽可以增加反應(yīng)體系的極性,抑制乙酸環(huán)己酯熱分解副反應(yīng)(β-消除反應(yīng))過渡態(tài)的生成,從而提高環(huán)己醇的選擇性。同時(shí),無機(jī)鹽會(huì)破壞HZSM-5表面B酸中心,降低其催化活性。單獨(dú)使用NaHSO_4對(duì)乙酸環(huán)己酯水解反應(yīng)也具有較好的催化性能,在適宜條件下,乙酸環(huán)己酯轉(zhuǎn)化率達(dá)到63.8%,環(huán)己醇選擇性達(dá)到90.9%;重復(fù)使用時(shí),由于乙酸在反應(yīng)體系中的積累,乙酸環(huán)己酯轉(zhuǎn)化率有所降低,環(huán)己醇選擇性基本不變。
[Abstract]:The effect of inorganic salts (NaBr,ZnSO_4,NaHSO_4) on the hydrolysis of cyclohexyl acetate to cyclohexanol catalyzed by HZSM-5 was investigated. The results show that inorganic salts can increase the polarity of the reaction system, inhibit the formation of transition state of the thermal decomposition side reaction of cyclohexyl acetate (尾-elimination reaction), and thus improve the selectivity of cyclohexanol. At the same time, inorganic salt can destroy the B acid center on the surface of HZSM-5 and decrease its catalytic activity. The hydrolysis of cyclohexyl acetate was also catalyzed by NaHSO_4 alone. Under the suitable conditions, the conversion of cyclohexyl acetate reached 63.8% and the selectivity of cyclohexanol reached 90.9%. During reuse, the conversion of cyclohexyl acetate decreased and the selectivity of cyclohexanol remained unchanged due to the accumulation of acetic acid in the reaction system.
【作者單位】: 河北工業(yè)大學(xué)化工學(xué)院河北省綠色化工與高效節(jié)能重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(21236001,21176056) 河北省自然科學(xué)基金項(xiàng)目(B2015202228) 河北省高校百名優(yōu)秀創(chuàng)新人才項(xiàng)目(BR2-208)資助
【分類號(hào)】:O643.3;TQ233.1
[Abstract]:The effect of inorganic salts (NaBr,ZnSO_4,NaHSO_4) on the hydrolysis of cyclohexyl acetate to cyclohexanol catalyzed by HZSM-5 was investigated. The results show that inorganic salts can increase the polarity of the reaction system, inhibit the formation of transition state of the thermal decomposition side reaction of cyclohexyl acetate (尾-elimination reaction), and thus improve the selectivity of cyclohexanol. At the same time, inorganic salt can destroy the B acid center on the surface of HZSM-5 and decrease its catalytic activity. The hydrolysis of cyclohexyl acetate was also catalyzed by NaHSO_4 alone. Under the suitable conditions, the conversion of cyclohexyl acetate reached 63.8% and the selectivity of cyclohexanol reached 90.9%. During reuse, the conversion of cyclohexyl acetate decreased and the selectivity of cyclohexanol remained unchanged due to the accumulation of acetic acid in the reaction system.
【作者單位】: 河北工業(yè)大學(xué)化工學(xué)院河北省綠色化工與高效節(jié)能重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(21236001,21176056) 河北省自然科學(xué)基金項(xiàng)目(B2015202228) 河北省高校百名優(yōu)秀創(chuàng)新人才項(xiàng)目(BR2-208)資助
【分類號(hào)】:O643.3;TQ233.1
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