主办单位：煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
Table2
典型载氮体介导的化学链合成氨过程
| Nitrogen carrier | Nitrogen carrier type | Hydrogen source | Drive type | Reaction conditions | Reaction rate (efficiency) |
Ref. |
| Ca3N2 | ionic nitride |
H2 | thermally driven |
N fixation：700 ℃ hydrogenation：550 ℃，1×105 Pa |
98 μmol/(g∙h) | [52] |
| CrN | transition metal nitride | H2 | thermally driven |
N fixation：750 ℃ hydrogenation：700 ℃，1×105 Pa |
83.55 μmol/(g∙h) | [36] |
| Co-CrN | transition metal nitride | H2 | thermally driven |
as above | 818.2 μmol/(g∙h) | [36] |
| Mo2N | transition metal nitride | H2 | thermally driven |
N fixation：600 ℃ hydrogenation：450 ℃，1×105 Pa |
4576 μmol/(g∙h) | [32] |
| BaNH | ionic nitride |
H2 | thermally driven |
N fixation & hydrogenation： 300 ℃，1×105 Pa |
198 μmol/(g∙h) | [66] |
| Ni-baNH | ionic nitride |
H2 | thermally driven |
as above | 3125 μmol/(g∙h) | [66] |
| Li2NH | ionic nitride |
H2 | thermoelectric coupling |
molten salt electrolytic cell： 2V，400 ℃，1×105 Pa |
64 μmol/(g∙h) | [71] |
| Li3N | ionic nitride |
H2O | thermoelectric coupling |
electrolysis： 3V，450 ℃，1×105 Pa N fixation & hydrolysis： 100 ℃，1×105 Pa |
88.5% （initial current efficiency） |
[48] |
| Mg3N2 | ionic nitride |
H2O | photothermal coupling |
N fixation：1×105 pa reduction & hydrolysis： <100 mTorr light source heating |
1.67 μmol/(g∙h) | [73] |
| Mn5N2 | transition metal nitride | H2O | thermally driven |
hydrolysis： 500 ℃，1×105 Pa N fixation： 1150 ℃，1×105 Pa |
54%，2 h (the percentage of lattice nitrogen converted to ammonia) |
[77] |
| CrN | transition metal nitride | H2O | thermally driven |
reduction： 1200−1500 ℃，1×105 Pa N fixation & hydrolysis： 1000 ℃，1×105 Pa |
108 μmol/(g∙h) | [78] |
| AlN | covalent metal nitride | H2O | thermally driven |
N fixation： 1500−1700 ℃，1×105 pa hydrolysis： 1000 ℃，1×105 Pa |
88%，1 h (the percentage of lattice nitrogen converted to ammonia) |
[81] |
Table1
载氮体的常见制备方法
| Method | Advantages | Disadvantages | Ref. |
| Co-precipitation method |
the operation is simple, the cost is low, the prepared nitrogen carrier material has high hardness, uniform components, and dense powder | the addition of precipitant may lead to high local concentrations and agglomeration | [29] |
| One-step pyrolysis method |
easy to operate, low preparation temperature and short time-consuming | the surface of the hydrogenated nitrogen carrier is rough and cracks appear | [30−33] |
| Mechanical mixing method |
simple to operate and easy to control | poor uniformity and easy agglomeration | [34−35] |
| Immersion method |
the operation is simple, easy to control, and the active component has a high atomic utilization | the preparation time is long, the uniformity is poor, and it is not suitable for industrial production | [34,36−37] |
| Sol-gel method | the prepared sample has a high specific surface area, controllable microstructure and good uniformity | the cost of raw materials is high and the preparation time is long | [38] |
| Molten salt synthesis method |
the operation is simple, the preparation temperature is low, the uniformity is good, and the product purity is high | the scope of application is small, the molten salt is toxic, and special equipment is required (PTFE lined steel reactor with nitrogen-filled glove box, etc.) | [39] |
Table3
反应1 h时不同焙烧温度n-Cr2O3催化正己烷脱氢反应
| Sample | n-Cr2O3-600 | n-Cr2O3-700 | n-Cr2O3-800 | n-Cr2O3-950 |
| Conversion of n-C6H14/% | 40.6 | 37.8 | 22.8 | 11.3 |
| Selectivity to product/% | ||||
| n-C6H12 | 20.1 | 21.5 | 25.1 | 28.2 |
| C6H6 | 69.3 | 68.1 | 64.4 | 60.6 |
| 2,4-C6H10 | 2.9 | 3.0 | 3.1 | 3.2 |
| Cracking products | 3.2 | 2.9 | 2.8 | 2.9 |
| Isomerization products | 2.8 | 2.9 | 2.9 | 3.0 |
| Others | 1.7 | 1.6 | 1.7 | 2.1 |
主办单位：煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会
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