Proposed catalysts of Table 1 represented by their element pairs.
| Proposed catalyst | Element pair 1 | Element pair 2 | Element pair 3 |
|---|---|---|---|
| EuMgZr–BaO | EuMg | EuZr | MgZr |
| MoKW–BaO | MoK | MoW | KW |
| KYV–BaO | KY | KV | VY |
| MoCsZr–BaO | MoCs | MoZr | CsZr |
| KYMo–BaO | KY | KMo | KMo |
| TiCsW–BaO | TiCs | TiW | TiW |
| MoCsLi–BaO | MoCs | MoLi | CsLi |
| CsZrW–BaO | CsZr | CsW | ZrW |
| TiTbW–BaO | TiTb | TiW | TbW |
| SrBaMo–BaO | SrBa | SrMo | BaMo |
| TbTi–CaO | TbTi | Tb | Ti |
| TKW–BaO | TK | TW | KW |
| MoLiW–BaO | MoLi | MoW | LiW |
| BaEuW–ZrO2 | BaEu | BaW | EuW |
| SrHf–BaO | SrHf | Sr | Hf |
| KVW–BaO | KV | KW | VW |
| MoVW–BaO | MoV | MoW | VW |
| LiEuW–ZrO2 | LiEu | LiW | EuW |
| EuLiW–ZrO2 | EuLi | EuW | LiW |
| SrMoW–BaO | SrMo | SrW | MoW |
| SrHfMo–BaO | SrHf | SrMo | HfMo |
| TbHfW–La2O3 | TbHf | TbW | HfW |
| KVW–MgO | KV | KW | VW |
| SrV–BaO | SrV | Sr | V |
| EuCsW–ZrO2 | EuCs | CsW | CsW |
| TiCeW–TiO2 | TiCe | TiW | CeW |
| EuMoW–ZrO2 | EuMo | EuW | MoW |
| EuVW–ZrO2 | EuV | EuW | VW |
| EuKW–ZrO2 | EuK | EuW | KW |
| EuHfW–ZrO2 | EuHf | EuW | HfW |
| EuYW–ZrO2 | EuY | EuW | YW |