CN109433212A - 一种煤化学链气化制富氢合成气中磁性载氧体及其制备 - Google Patents
一种煤化学链气化制富氢合成气中磁性载氧体及其制备 Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000001301 oxygen Substances 0.000 title claims abstract description 72
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 72
- 239000003245 coal Substances 0.000 title claims abstract description 21
- 238000002309 gasification Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 title claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims description 8
- 239000001257 hydrogen Substances 0.000 title claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 title claims description 8
- 229910003264 NiFe2O4 Inorganic materials 0.000 claims abstract description 33
- 229960000892 attapulgite Drugs 0.000 claims abstract description 33
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 13
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims abstract description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 3
- 239000011575 calcium Substances 0.000 claims abstract description 3
- 239000000470 constituent Substances 0.000 claims abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 3
- 239000011777 magnesium Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- NQNBVCBUOCNRFZ-UHFFFAOYSA-N nickel ferrite Chemical compound [Ni]=O.O=[Fe]O[Fe]=O NQNBVCBUOCNRFZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 238000005119 centrifugation Methods 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 7
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 7
- 239000012279 sodium borohydride Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 229910052596 spinel Inorganic materials 0.000 claims description 6
- 239000011029 spinel Substances 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- MVFCKEFYUDZOCX-UHFFFAOYSA-N iron(2+);dinitrate Chemical compound [Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MVFCKEFYUDZOCX-UHFFFAOYSA-N 0.000 claims description 2
- 239000002923 metal particle Substances 0.000 claims description 2
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 230000001131 transforming effect Effects 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 11
- 229910002651 NO3 Inorganic materials 0.000 description 10
- 238000004090 dissolution Methods 0.000 description 10
- 238000004821 distillation Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910002518 CoFe2O4 Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910016516 CuFe2O4 Inorganic materials 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
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Abstract
本发明涉及一种磁性载氧体的NiFe2O4载氧体及其制备方法。采用氧化还原法,控制适宜的反应条件,一步法制备出高稳定性和磁性的载氧体,该方法制备的载氧体是NiFe2O4和凹凸土组成的复合载氧体,NiFe2O4高度分散在凹凸土的表面,凹凸土中的镁、钙元素抑制了NiFe2O4的深度还原,并有效的控制还原价态在Fe3O4,进一步强化了水汽变换反应和提高了载氧体的抗烧结能力。本法制备简单,载氧体稳定性高等优点。同时可以实现煤化学链气化过程中,载氧体和未燃尽煤、燃尽灰渣等固体颗粒的高效分离。
Description
技术领域
本发明属于煤化学链气化技术中载氧体颗粒的制备技术领域。具体涉及一种磁性载氧体的NiFe2O4载氧体及其制备方法。
背景技术
载氧体是煤化学链气化的关键。优良的载氧体应具有较高的氧化还原反应活性、良好的机械强度、抗烧结和抗团聚能力、经济性以及环境友好。过渡金属元素镍、铁、铜、钴、以及锰被认为是载氧体的理想选择,但是这些材料都存在着各种各样的缺陷。一般的氧化铜熔点较低易发生烧结,氧化锰和氧化铁低的载氧能力和较弱的反应性能,氧化镍和氧化钴对环境产生不利影响。
为了找到性能更加优异的载氧体,研究学者们设计双金属活性复合的载氧体。目前,由于铁基载氧体具有价格低廉/来源广泛、环境友好等优势,基于铁基载氧体的双活性组分载氧体被大量开发和测试。近年来,铁酸盐在化学链燃烧过程中取得了很好的效果。另外,具有尖晶石结构的金属酸盐具有很高的热稳定性和磁性性能。高的热稳定性增加了氧载体的使用寿命,磁性特性可以将氧载体与灰分通过磁分离技术进行分离。
因此,金属铁酸盐在固体化学链技术中表现出巨大的潜力。目前,牛欣等人考察了铁酸铜在污泥化学链燃烧中的表现,发现铁酸铜具有较好的反应性能,王等人研究MFe2O4(M=Cu,Ni和Co)三种铁酸盐与木屑的化学链燃烧反应性能,发现CuFe2O4表现出最高的反应性能和最低的反应温度,NiFe2O4具有最好的焦油催化性能,CoFe2O4很容易还原到FeO。五次循环后三种铁酸盐都可以再生,其中CuFe2O4 和CoFe2O4 表现出较好的热稳定,但NiFe2O4在生物质化学链气化过程中容易发生烧结,导致循环稳定性下降。
发明内容
本发明的目的在于克服现有技术存在的缺点,提供了一种用于煤化学气化制备富氢合成气的载氧体及其制备方法。该载氧体的循环稳定性较好,氧循环能力强、磁性强。载氧体由尖晶石结构的NiFe2O4复合金属氧化物和凹凸土组成,该载氧体中具有尖晶石结构的NiFe2O4的含量约为50-90%,凹凸土的含量约为10%-50%。载氧体在煤化学链气化过程中的应用,其中载氧体在燃料反应器的温度为950℃,在空气反应器中的反应温度为900℃。反应压力为常压,使用的燃料是煤等固态燃料。
本发明煤化学链气化技术载氧体含有尖晶石结构的NiFe2O4和凹凸土,具有尖晶石结构的载氧体有很高的热稳定性和磁性能,不仅可以为煤气化所需热量,还原态载氧体可以催化水汽变换反应,提高产物中H2的选择性;NiFe2O4分散在天然凹凸土载体的表面,解决了NiFe2O4作为载氧体时在高温下存在容易烧结的问题。
本发明采用氧化还原法,控制适宜的反应条件,一步法制备出高稳定性和磁性的载氧体,该方法制备的载氧体是NiFe2O4和凹凸土组成的复合载氧体,NiFe2O4高度分散在凹凸土的表面,凹凸土中的镁、钙元素抑制了NiFe2O4的深度还原,并有效的控制还原价态在Fe3O4,进一步强化了水汽变换反应和提高了载氧体的抗烧结能力。
与现有技术相比,本发明化学链气化制备富氢合成气载氧体具有制备方法简单、稳定性高和催化水汽变换反应等优点。同时可以实现煤化学链气化过程中,载氧体和未燃尽煤、燃尽灰渣等固体颗粒的高效分离。
本发明的载氧体应用于煤化学链气化过程中,携带热量完成煤气化,载氧体在成为还原态时,作为催化水汽变换反应的催化剂,将CO和水蒸气转化氢气和二氧化碳;载氧体在煤化学链气化中,于燃料反应器的温度为800-1000℃,于空气反应器中的反应温度为800-1000℃。
所述载氧体的制备方法包括如下步骤:
(1)按Ni3+/Fe3+摩尔比为0.5~2,配制硝酸镍和硝酸铁溶液;
(2)按[NaBH4]/[Ni3++Fe3+]摩尔比为2-4,配制NaBH4溶液;
(3)将上述两种溶液缓慢均匀的加入胶体磨中,剧烈搅拌3 min,得到含有纳米金属粒子的混合溶液A;
(4)继续剧烈搅拌1min,按NiFe2O4/凹凸土质量比为1~5,继续搅拌4min。将上述混合溶液转移到聚四氟乙烯内胆的高压反应釜中,于150 ℃水热晶化12 h;
(5)自然冷却至室温,离心、洗涤;
(6)在空气中自然晾干后,转入100-140℃的干燥箱中干燥12-24 h,之后再置于800-1000 ℃的马弗炉中恒温煅烧3-8 h,破碎,筛分,得载氧体。
载氧体可以是球形、条形、微球形状,载氧体颗粒尺寸为10um-2000um,优选的颗粒尺寸为50-500um。
附图说明
图1为本发明实施例1所制得复合NiFe2O4/凹凸土的X射线衍射图。
具体实施方式
实施例1
取11.63gNi(NO3)2·6H2O和32.32gFe(NO3)2·6H2O放入500ml的烧杯中,加入200ml蒸馏水,搅拌至全部溶解,得到A溶液。然后取9.12g硼氢化钠放入500ml烧杯中,加入280ml蒸馏水,搅拌至全部溶解,得到B溶液。将上述A液和B液缓慢均匀的加入胶体磨中,搅拌3min。然后加入1.06g的凹凸土,继续搅拌1min,将上述混合溶液转移到500ml聚四氟乙烯内胆的高压反应釜中。将反应釜放入到150℃的干燥箱中水热晶化12h。然后取出反应釜,自然冷却至室温,离心、洗涤,得到NiFe2O4/凹凸土复合载氧体颗粒。在空气中自然晾干后,置于马弗炉中,以3℃/min的升温速率从室温升至950℃煅烧6h,破碎,用标准筛筛分后得到粒径为75-150μm的复合载氧体颗粒,其中NiFe2O4的质量含量为90wt%,凹凸土的含量为10wt%。
图1是本发明实施例1所制得复合NiFe2O4/凹凸土的X射线衍射图。将NiFe2O4的标准卡片PDF#22-1086和NiFe2O4的标准卡片PDF#10-0325与样品对比,可知NiFe2O4属于Fd3m立方的尖晶石结构,从XRD谱图的衍射指数可以看出还原氧化法成功的制备了晶体结构完美的NiFe2O4尖晶石。
实施例2
取11.63gNi(NO3)2·6H2O和32.32gFe(NO3)2·6H2O放入500ml的烧杯中,加入200ml蒸馏水,搅拌至全部溶解,得到A溶液。然后取9.12g硼氢化钠放入500ml烧杯中,加入280ml蒸馏水,搅拌至全部溶解,得到B溶液。将上述A液和B液缓慢均匀的加入胶体磨中,搅拌3min。然后加入2.34g的凹凸土,继续搅拌1min,将上述混合溶液转移到500ml聚四氟乙烯内胆的高压反应釜中。将反应釜放入到150℃的干燥箱中水热晶化12h。然后取出反应釜,自然冷却至室温,离心、洗涤,得到NiFe2O4/凹凸土复合载氧体颗粒。在空气中自然晾干后,置于马弗炉中,以3℃/min的升温速率从室温升至950℃煅烧6h,破碎,用标准筛筛分后得到粒径为75-150μm的复合载氧体颗粒,其中NiFe2O4的质量含量为80wt%,凹凸土的含量为20wt%。
实施例3
取11.63gNi(NO3)2·6H2O和32.32gFe(NO3)2·6H2O放入500ml的烧杯中,加入200ml蒸馏水,搅拌至全部溶解,得到A溶液。然后取9.12g硼氢化钠放入500ml烧杯中,加入280ml蒸馏水,搅拌至全部溶解,得到B溶液。将上述A液和B液缓慢均匀的加入胶体磨中,搅拌3min。然后加入4.01g的凹凸土,继续搅拌1min,将上述混合溶液转移到500ml聚四氟乙烯内胆的高压反应釜中。将反应釜放入到150℃的干燥箱中水热晶化12h。然后取出反应釜,自然冷却至室温,离心、洗涤,得到NiFe2O4/凹凸土复合载氧体颗粒。在空气中自然晾干后,置于马弗炉中,以3℃/min的升温速率从室温升至950℃煅烧6h,破碎,用标准筛筛分后得到粒径为75-150μm的复合载氧体颗粒,其中NiFe2O4的质量含量为70wt%,凹凸土的含量为30wt%。
实施例4
取11.63gNi(NO3)2·6H2O和32.32gFe(NO3)2·6H2O放入500ml的烧杯中,加入200ml蒸馏水,搅拌至全部溶解,得到A溶液。然后取9.12g硼氢化钠放入500ml烧杯中,加入280ml蒸馏水,搅拌至全部溶解,得到B溶液。将上述A液和B液缓慢均匀的加入胶体磨中,搅拌3min。然后加入6.25g的凹凸土,继续搅拌1min,将上述混合溶液转移到500ml聚四氟乙烯内胆的高压反应釜中。将反应釜放入到150℃的干燥箱中水热晶化12h。然后取出反应釜,自然冷却至室温,离心、洗涤,得到NiFe2O4/凹凸土复合载氧体颗粒。在空气中自然晾干后,置于马弗炉中,以3℃/min的升温速率从室温升至950℃煅烧6h,破碎,用标准筛筛分后得到粒径为75-150μm的复合载氧体颗粒,其中NiFe2O4的质量含量为60wt%,凹凸土的含量为40wt%。
实施例5
取11.63gNi(NO3)2·6H2O和32.32gFe(NO3)2·6H2O放入500ml的烧杯中,加入200ml蒸馏水,搅拌至全部溶解,得到A溶液。然后取9.12g硼氢化钠放入500ml烧杯中,加入280ml蒸馏水,搅拌至全部溶解,得到B溶液。将上述A液和B液缓慢均匀的加入胶体磨中,搅拌3min。然后加入9.37g的凹凸土,继续搅拌1min,将上述混合溶液转移到500ml聚四氟乙烯内胆的高压反应釜中。将反应釜放入到150℃的干燥箱中水热晶化12h。然后取出反应釜,自然冷却至室温,离心、洗涤,得到NiFe2O4/凹凸土复合载氧体颗粒。在空气中自然晾干后,置于马弗炉中,以3℃/min的升温速率从室温升至950℃煅烧6h,破碎,用标准筛筛分后得到粒径为75-150μm的复合载氧体颗粒,其中NiFe2O4的质量含量为50wt%,凹凸土的含量为50wt%。
Claims (2)
1.一种煤化学链气化制富氢合成气中磁性载氧体及其制备,其特征在于:所述载氧体具有磁性,是NiFe2O4和凹凸土组成的复合载氧体;所述NiFe2O4为尖晶石结构,占载氧体含量的50-90%;所述载氧体中凹凸土,占载氧体含量的10%-50%;所述NiFe2O4和凹凸土相互作用,其中NiFe2O4分散在凹凸土的表面,凹凸土中的镁、钙元素抑制NiFe2O4还原,并有效的控制还原价态在Fe3O4;所述载氧体应用于煤化学链气化过程中,所述载氧体携带热量完成煤气化,载氧体在成为还原态时,作为催化水汽变换反应的催化剂,将CO和水蒸气转化氢气和二氧化碳;所述载氧体在煤化学链气化中,于燃料反应器的温度为800-1000℃,于空气反应器中的反应温度为800-1000℃;
所述载氧体的制备方法包括如下步骤:
(1)按Ni3+/Fe3+摩尔比为0.5~2,配制硝酸镍和硝酸铁溶液;
(2)按[NaBH4]/[Ni3++Fe3+]摩尔比为2-4,配制NaBH4溶液;
(3)将上述两种溶液缓慢均匀的加入胶体磨中,剧烈搅拌3 min,得到含有纳米金属粒子的混合溶液A;
(4)继续剧烈搅拌1min,按NiFe2O4/凹凸土质量比为1~5,继续搅拌4min;
将上述混合溶液转移到聚四氟乙烯内胆的高压反应釜中,于150 ℃水热晶化12 h;
(5)自然冷却至室温,离心、洗涤;
(6)在空气中自然晾干后,转入100-140℃的干燥箱中干燥12-24 h,之后再置于800-1000 ℃的马弗炉中恒温煅烧3-8 h,破碎,筛分,得载氧体。
2.根据权利要求1所述的一种煤化学链气化制富氢合成气中磁性载氧体及其制备,其特征在于:所述载氧体可以是球形、条形、微球形状,载氧体颗粒尺寸为10um-2000um,优选的颗粒尺寸为50-500um。
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