CN108314055B - 一种薄片状sapo-34的合成方法 - Google Patents
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Abstract
一种薄片状SAPO‑34的合成方法是将SAPO‑34晶化母液进行减压蒸馏,蒸发掉部分水,再补加铝源、磷源、硅源及氟化物,分散均匀后装釜晶化得到晶核溶液;依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源充分分散后制成初始凝胶;向初始凝胶中加入晶核溶液,分散均匀后装入高压反应釜晶化后经离心、洗涤、干燥、焙烧即获得薄片状的SAPO‑34原粉。本发明有效地延长SAPO‑34分子筛的MTO催化寿命,并且可重复利用SAPO‑34分子筛生产过程产生的大量晶化母液的优点。
Description
技术领域
本发明属于一种SAPO-34的合成方法,本发明具体涉及一种薄片状SAPO-34分子筛的合成方法。
背景技术
1982年,UCC公司开发了一类新的含磷分子筛———磷酸硅铝分子筛(SAPO),其中SAPO-34对MTO表现出了较好的反应活性和乙烯丙烯选择性。但由于SAPO-34分子筛在MTO反应中存在快速结焦失活现象,使其应用受到较大限制。通过控制SAPO-34分子筛的硅分布和硅含量,从而调变酸密度和酸强度以及改变SAPO-34传统的立方块状形貌,制备成堆积的薄片层状形貌有利于反应产物快速扩散,从而提高催化剂抗积碳能力。
SAPO-34分子筛一般采用常规水热合成方法制备,但随着工业地快速发展,环境问题日益成为一个严峻的全球性问题,水热合成法产生的晶化母液给环境带来巨大的压力的环境压力不得不引起广泛的关注。
近年来国内外同行对晶化母液回用进行了大量的研究,但几乎不能实现零排放,工业上若将母液直接回用一方面产品性能没有保障,另一方面不能达到完全循环,还有一大部分需要排放,还是不能从根本上完全解决母液。
发明内容
本发明的目的是提供一种催化寿命长,并且可重复利用SAPO-34分子筛生产过程产生中晶化母液的薄片状SAPO-34分子筛的合成方法。
本发明是通过对晶化母液的再晶化处理,制得了富含晶核前驱体的晶核溶液,用晶核溶液来配制凝胶进而晶化,所得到的晶化产物为薄片状的SAPO-34产品,其MTO催化性能优异,抗积碳能力强,且母液可重复多次利用,完善的工艺还可有效地解决水热合成所带来的环境问题。
本发明的一种薄片状SAPO-34分子筛的合成方法,包括以下步骤:
(1)将SAPO-34晶化母液进行减压蒸馏,蒸发掉部分水;
(2)向蒸发掉部分水的母液中补加铝源、磷源、硅源及氟化物,分散均匀后装釜并置于100-140℃晶化5-10h后取出,得到晶核溶液;
(3)依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源充分分散后制成初始凝胶;
(4)向初始凝胶中加入晶核溶液,分散均匀后装入高压反应釜于140-200℃晶化1-3天,取出后经离心、洗涤、干燥、焙烧即获得薄片状的SAPO-34分子筛。
所述步骤(1)的中减压蒸馏温度为50-100℃,蒸发掉部分水,使母液固含量提高至50%-70%。
所述步骤(2)中先分析母液中P、Al、Si、F的含量,后通过计算补加铝源、磷源、硅源及氟化物,使补加后母液中元素摩尔比P:Al:Si:F为1.0:1.0:0.2-0.6:0.05-0.2。
所述步骤(3)中配制的初始凝胶中各种原料摩尔配比P2O5:Al2O3:SiO2:有机胺模板:H2O为1.0:0.8-1.2:0.06-0.6:1.0-2.0:30-50。
所述步骤(4)中晶核溶液的加入量为初始凝胶总质量的30%-50%。
所述的步骤(2)、(3)中硅源为硅溶胶、正硅酸乙酯的一种。
所述步骤(2)、(3)中的铝源为拟薄水铝石、异丙醇铝的一种。
所述步骤(2)、(3)中的磷源为为磷酸。
所述步骤(2)中的氟化物为HF、NH4F中的一种。
所述步骤(3)模板剂为四乙基氢氧化铵(TEAOH)、三乙胺(TEA)、二乙胺(DEA)的一种或多种。
本发明制备的SAPO-34分子筛在甲醇制烯烃中的应用,包括如下步骤:
将上述催化剂用于固定床甲醇制烯烃反应,将催化剂装入反应器恒温区,两端用石英砂填充,在氮气气氛下升温至550-650℃活化1-2h,随后降温,恒温区温度降至400-450℃后开始通入质量浓度为40%-95%的甲醇,在质量空速为1.0-20.0h-1,常压下进行反应。
本发明与现有技术相比具有如下优点:
1、所得的SAPO-34分子筛、形貌为纳米薄片状,其长度宽度约1微米左右,其厚度为10-100nm之间。
2、所得到的薄片状SAPO-34分子筛用于甲醇制烯烃反应时,抗积碳能力强、单程催化寿命延长40-90%。
2、可有效地利用水热合成SAPO-34时产生的晶化母液,变废为宝,多次循环利用,实现绿色生产。
附图说明
图1:传统水热法合成的立方块状SAPO-34分子筛与本发明合成的薄片状SAPO-34分子筛的SEM对照图。
图2:传统水热法合成的立方块状SAPO-34分子筛与本发明合成的薄片状SAPO-34分子筛的MTO反应催化性能对照图。
表1:各实例母液中的元素组成。
具体实施方式
下面通过实例详述本发明
对比例1
以初始摩尔凝胶比为30H2O:0.3SiO2(硅溶胶):1.0Al2O3(拟薄水铝石):1.0P2O5(磷酸):1.0TEAOH制备凝胶,密封后置于200℃烘箱晶化48h,反应结束后离心分离产品,收集母液(MY-0,其元素组成见表1),将分子筛洗涤、烘干后置于550℃马弗炉内焙烧300min,即可得到最终产品(S-0),其形貌和催化性能见图2所示,其形貌为2μm左右的立方块状,催化寿命为116min,双烯(乙烯,丙烯)最高选择性为83.85%。
实施例1
取MY-0母液100℃下减压蒸馏掉部分水,使母液固含量提高至70%。补加原料使各物种摩尔比为1.0P(磷酸):1.0Al(拟薄水铝石):0.2Si(硅溶胶):0.05F(NH4F),分散均匀后密封置于100℃烘箱内预晶化5h后得到晶核溶液;再依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源,各物料的摩尔比为1.0P2O5(磷酸):1.2Al2O3(拟薄水铝石):0.06SiO2(硅溶胶):1.0TEAOH:50H2O充分分散后制成初始凝胶;向初始凝胶中添加晶核溶液制成凝胶,晶核溶液的添加量占凝胶总质量的30%,凝胶分散均匀后密封置于140℃烘箱晶化24h,反应结束后离心分离得到母液(MY-1,其元素组成见表1),将分子筛洗涤干燥后置于550℃马弗炉内焙烧300min,得到纳米薄层样品(S-1),其形貌和催化性能见图1、图2所示,其形貌为厚度约10-100nm的薄片状,催化寿命延长至228min,双烯最高选择性达84.98%。
实施例2
取MY-1母液80℃下减压蒸馏掉部分水,使母液固含量提高至70%。补加原料使各物种摩尔比为1.0P(磷酸):1.0Al(拟薄水铝石):0.4Si(硅溶胶):0.75F(NH4F),分散均匀后密封置于100℃烘箱内预晶化10h后得到晶核溶液;依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源,各物料的摩尔比为1.0P2O5(磷酸):1.0Al2O3(拟薄水铝石):0.3SiO2(硅溶胶):2.0TEA:40H2O;向初始凝胶中添加晶核溶液制成凝胶,晶核溶液的添加量占凝胶总质量的40%,凝胶分散均匀后密封置于170℃烘箱晶化48h,反应结束后离心分离得到母液(MY-2,其元素组成见表1),将分子筛洗涤干燥后置于550℃马弗炉内焙烧300min,得到纳米薄层样品(S-2),其形貌和催化性能见图1图2所示,其形貌规整,为薄片状晶体,厚度约10-100nm,催化寿命为196min,双烯最高选择性达84.64%。
实施例3
取MY-2母液60℃下减压蒸馏掉部分水,使母液固含量提高至60%。补加原料使各物种摩尔比为1.0P(磷酸):1.0Al(拟薄水铝石):0.6Si(硅溶胶):0.2F(HF),分散均匀后密封置于140℃烘箱内预晶化5h后得到晶核溶液;依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源,各物料的摩尔比为1.0P2O5(磷酸):0.8Al2O3(拟薄水铝石):0.6SiO2(正硅酸乙酯):2.DEA:30H2O;向初始凝胶中添加晶核溶液制成凝胶,晶核溶液的添加量为凝胶总质量的50%,凝胶分散均匀后密封置于200℃烘箱晶化72h,反应结束后离心分离得到母液(MY-3,其元素组成见表1),将分子筛洗涤干燥后置于550℃马弗炉内焙烧300min,得到纳米薄层样品(S-3),其形貌和催化性能见图1图2所示,其粒径稍为变大,但仍为厚度约10-100nm的薄片状晶体,催化寿命为180min,双烯最高选择性达84.17%。
实施例4
取MY-3母液50℃下减压蒸馏掉部分水,使母液固含量提高至50%。补加原料使各物种摩尔比为1.0P(磷酸):1.0Al(异丙醇铝):0.2Si(正硅酸乙酯):0.75F(NH4F),分散均匀后密封置于120℃烘箱内预晶化8h后得到晶核溶液;依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源,各物料的摩尔比为1.0P2O5(磷酸):1.0Al2O3(异丙醇铝):0.3SiO2(硅溶胶):1.0TEA:1.0DEA:40H2O;向初始凝胶中添加晶核溶液制成凝胶,晶核溶液的添加量占凝胶总质量的50%,凝胶分散均匀后密封置于170℃烘箱晶化48h,反应结束后离心分离得到母液,将分子筛洗涤干燥后置于550℃马弗炉内焙烧300min,得到纳米薄层样品(S-4),其形貌和催化性能见图1、图2所示,其形貌为厚度约10-100nm薄片状晶体,催化寿命为164min,双烯最高选择性达85.10%。
上述实例中得到的S-0、S-1、S-2、S-3、S-4造粒,称取2.5g 40-60目的颗粒样品用于固定床甲醇制烯烃反应,将样品装入反应器恒温区,两端用石英砂填充,在氮气气氛下升温至550℃活化1h,随后降温,管芯温度降至450℃后开始通甲醇(质量分数为40%),控制空速为4.0h-1,每隔16min取样进气相色谱分析评价结果如图2所示。由图2可知,薄片状SAPO-34样品(S-1、S-2、S-3、S-4)较对比样S-0催化寿命延长了40%-90%,单程寿命最长可达228min。
表1
Claims (7)
1.一种薄片状SAPO-34的合成方法,其特征在于包括如下步骤:
(1)将SAPO-34晶化母液进行减压蒸馏,蒸发掉部分水;
(2) 向蒸发掉部分水的母液中补加铝源、磷源、硅源及氟化物,使补加后母液中元素摩尔比P:Al:Si:F 为1.0:1.0:0.2-0.6:0.05-0.2,分散均匀后装釜并置于100-140℃烘箱内晶化5-10h后取出,得到晶核溶液;
(3)依次向去离子水中加入铝源、硅源、有机胺模板剂及磷源充分分散后制成初始凝胶,初始凝胶中各种原料摩尔配比P2O5:Al2O3:SiO2:有机胺模板:H2O为1.0:0.8-1.2:0.06-0.6:1.0-2.0:30-50;
(4)向初始凝胶中加入晶核溶液,分散均匀后装入高压反应釜于140-200℃烘箱内晶化1-3天,取出后经离心、洗涤、干燥、焙烧即获得薄片状的SAPO-34原粉。
2.如权利要求1所述的一种薄片状SAPO-34的合成方法,其特征在于所述步骤(1)的中减压蒸馏温度为50-100℃, 蒸发掉部分水,使母液固含量提高至50%-70% 。
3.如权利要求1所述的一种薄片状SAPO-34的合成方法,其特征在于所述步骤(4)中晶核溶液的加入量为初始凝胶总质量的30%-50%。
4.如权利要求1所述的一种薄片状SAPO-34的合成方法,其特征在于所述的步骤(2)、(3)中硅源为硅溶胶、正硅酸乙酯中的一种,铝源为拟薄水铝石、异丙醇铝中的一种,磷源为磷酸。
5.如权利要求1所述的一种薄片状SAPO-34的合成方法,其特征在于所述步骤(2)中的氟化物为HF、NH4F中的一种。
6.如权利要求1所述的一种薄片状SAPO-34的合成方法,其特征在于所述步骤(3)模板剂为四乙基氢氧化铵、三乙胺、二乙胺的一种或多种。
7.如权利要求 1-6任一项所述方法合成的薄片状SAPO-34,其特征在于是由其合成方法制备的。
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